Stabilizers for silicates in antifreeze compositions

Abstract

Stabilizers for silicate corrosion inhibitors useful in polyalkylene glycol antifreeze compositions are provided comprising an organosiloxane containing a polyoxyalkylene end chain.

I claim: 
     
       1. An organosiloxane compound of the general formula   HO(C.sub.n H.sub.2n O).sub.x CH.sub.2 CH(OH)CH.sub.2 O(CH.sub.2).sub.3 SiO.sub.1.5                                               (II)     wherein   x is a number from 5 to 10 and   n is a number from 2 to 4.   
     
     
       2. The organosiloxane compound of claim 1 wherein x is 6 to 9 and n is 2. 
     
     
       3. An antifreeze composition comprising an alkylene glycol, a silicate inhibitor and a stabiliser of the general formula:   HO(C.sub.n H.sub.2n O).sub.x CH.sub.2 CH(OH)CH.sub.2 O(CH.sub.2).sub.3 SiO.sub.1.5                                               (II)     
     
     
       4. The antifreeze composition of claim 3 wherein in the stabiliser of formula (II) x is 6 to 9 and n is 2. 
     
     
       5. The antifreeze composition of claim 3 wherein the alkylene glycol is propylene glycol, ethylene glycol or mixtures thereof.